Here you can find the source of getAllTimezonesSorted()
public static String[] getAllTimezonesSorted()
//package com.java2s; /*/*from w w w .jav a 2 s . c o m*/ * WaqtSalat, for indicating the muslim prayers times in most cities. Copyright * (C) 2011 Papa Issa DIAKHATE (paissad). * * This program is free software: you can redistribute it and/or modify it under * the terms of the GNU General Public License as published by the Free Software * Foundation, either version 3 of the License, or (at your option) any later * version. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. * * PLEASE DO NOT REMOVE THIS COPYRIGHT BLOCK. */ import java.util.Arrays; import java.util.Collections; import java.util.TimeZone; public class Main { /** * Retrieve all available time zones IDs and sort them. * * @return The sorted array of all time zones. */ public static String[] getAllTimezonesSorted() { String[] tmz = TimeZone.getAvailableIDs(); Collections.sort(Arrays.asList(tmz)); return tmz; } }